metamorphic
Polished blue-green stone, likely serpentine or chrysocolla-bearing rock
Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing
AI-generated identification · may be incorrectDark blue-green with pale veining and a waxy-to-glassy polish; likely Mohs 2.5–5.5, nonmetallic luster, massive rather than visibly crystalline, with indistinct cleavage. The image alone cannot distinguish serpentine from chrysocolla, turquoise matrix, or similarly colored stones.
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Physical properties
Dark blue-green with pale veining and a waxy-to-glassy polish; likely Mohs 2.5–5.5, nonmetallic luster, massive rather than visibly crystalline, with indistinct cleavage. The image alone cannot distinguish serpentine from chrysocolla, turquoise matrix, or similarly colored stones.
Formation & geological history
Serpentine forms when ultramafic rocks hydrate during low-temperature metamorphism, commonly in ophiolite zones; deposits range from Precambrian to Cenozoic. Blue-green veining may reflect later copper-mineral alteration.
Uses & applications
Used as a decorative carving and ornamental stone; attractive pieces are sold as lapidary specimens, cabochons, or polished worry stones. Serpentine has also been used historically in architectural stone, though fibrous varieties may contain asbestos.
Geological facts
The color commonly comes from chromium, iron, or copper-bearing minerals. Avoid grinding or sawing uncertain serpentine because some varieties contain hazardous chrysotile fibers.
Field identification & locations
Common localities include California, Vermont, Italy, New Zealand, and Afghanistan; identify with a hardness test, streak, density, and copper-mineral reactions rather than color alone. It appears tumbled or polished in the photograph.
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